From c388f408b538b38db83999fd20b17020d5fdf68f Mon Sep 17 00:00:00 2001 From: Thomas Huth Date: Wed, 8 Jan 2020 15:47:02 +0100 Subject: [PATCH] ui: Print available display backends with '-display help' MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit We already print availabled devices with "-device help", or available backends with "-netdev help" or "-chardev help". Let's provide a way for the users to query the available display backends, too. Reviewed-by: Philippe Mathieu-Daudé Tested-by: Philippe Mathieu-Daudé Signed-off-by: Thomas Huth Message-id: 20200108144702.29969-1-thuth@redhat.com Signed-off-by: Gerd Hoffmann --- include/ui/console.h | 1 + qemu-options.hx | 3 ++- ui/console.c | 15 +++++++++++++++ vl.c | 5 +++++ 4 files changed, 23 insertions(+), 1 deletion(-) diff --git a/include/ui/console.h b/include/ui/console.h index 281f9c145b5..f35b4fc082b 100644 --- a/include/ui/console.h +++ b/include/ui/console.h @@ -442,6 +442,7 @@ void qemu_display_register(QemuDisplay *ui); bool qemu_display_find_default(DisplayOptions *opts); void qemu_display_early_init(DisplayOptions *opts); void qemu_display_init(DisplayState *ds, DisplayOptions *opts); +void qemu_display_help(void); /* vnc.c */ void vnc_display_init(const char *id, Error **errp); diff --git a/qemu-options.hx b/qemu-options.hx index d4b73ef60c1..709162c159a 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -1669,7 +1669,8 @@ STEXI @item -display @var{type} @findex -display Select type of display to use. This option is a replacement for the -old style -sdl/-curses/... options. Valid values for @var{type} are +old style -sdl/-curses/... options. Use @code{-display help} to list +the available display types. Valid values for @var{type} are @table @option @item sdl Display video output via SDL (usually in a separate graphics diff --git a/ui/console.c b/ui/console.c index ac79d679f57..69339b028bb 100644 --- a/ui/console.c +++ b/ui/console.c @@ -2333,6 +2333,21 @@ void qemu_display_init(DisplayState *ds, DisplayOptions *opts) dpys[opts->type]->init(ds, opts); } +void qemu_display_help(void) +{ + int idx; + + printf("Available display backend types:\n"); + for (idx = DISPLAY_TYPE_NONE; idx < DISPLAY_TYPE__MAX; idx++) { + if (!dpys[idx]) { + ui_module_load_one(DisplayType_str(idx)); + } + if (dpys[idx]) { + printf("%s\n", DisplayType_str(dpys[idx]->type)); + } + } +} + void qemu_chr_parse_vc(QemuOpts *opts, ChardevBackend *backend, Error **errp) { int val; diff --git a/vl.c b/vl.c index 158a05ed321..751401214c8 100644 --- a/vl.c +++ b/vl.c @@ -1869,6 +1869,11 @@ static void parse_display(const char *p) { const char *opts; + if (is_help_option(p)) { + qemu_display_help(); + exit(0); + } + if (strstart(p, "sdl", &opts)) { /* * sdl DisplayType needs hand-crafted parser instead of